Availability

Availability is the parameter that takes into account
downtime. When a machine is not running due to a fault you are losing
planned production time :

Availability =
Operating Time / Planned Production Time

Performance

Many companies use a variation here
based on a Nett/Cycle calculation:

Performance = (Ideal Cycle Time * Pieces Produced) / Operating Time

Ideal Cycle Time
is the maximum speed the machine can run expressed as a unit cycle time. It
is sometimes called Name Plate Cycle Time.

Performance
is capped at 100%, This will ensure if a cycle time is specified too low the
performance figure will not distort the calculation.

Quality

Quality takes into account wastage due to poor Quality.

Quality = Good Pieces / Pieces Produced

Many companies use the quality component to recharge
suppliers if externally sourced components are faulty.

OEE IMPACT and the OEE
Calculation

OEE IMPACT
can derive OEE from both manually
entered
data and data gathered automatically from the plant. By multiplying the three components of OEE
together a hard and realistic KPI benchmark can be determined against which
future performance can be measured.

The worldwide
average for Overall Equipment Effectiveness in manufacturing plants
is between 45 and 60 percent. To achieve 'world class' manufacturing status
a level of 85% or better should be targeted. OEE IMPACT Software for downtime and efficiency
provides the tools which will help you to achieve
this.

Every
plant and manufacturing process is different. If you operate a policy of
Six-Sigma then quality levels of 96.5 % would be unacceptable - 99.99% would
be a better target to achieve.